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Income Taxes - Net Deferred Income Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Net deferred income tax liabilities |  |
Deferred income tax assets | $ 59,895 | $ 71,343
Deferred income tax liabilities | (33,099) | (48,411)
Valuation allowance | (21,700) | (19,916)
Net deferred income tax assets | $ 5,096 | $ 3,016

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